package com.ethanzzh.browser.controller;

import com.ethanzzh.browser.support.SimpleResponse;
import com.ethanzzh.security.core.properties.SecurityProperties;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.security.web.DefaultRedirectStrategy;
import org.springframework.security.web.RedirectStrategy;
import org.springframework.security.web.savedrequest.HttpSessionRequestCache;
import org.springframework.security.web.savedrequest.RequestCache;
import org.springframework.security.web.savedrequest.SavedRequest;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseStatus;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@RestController
public class BrowserSecurityController {

    private static final Logger LOGGER = LoggerFactory.getLogger(BrowserSecurityController.class);

    //springSecurity把当前到请求缓存到session中, 当跳转到/authentication/require请求后,再用requestCache 从session把缓存到请求拿出来
    private RequestCache requestCache = new HttpSessionRequestCache();

    private RedirectStrategy redirectStrategy = new DefaultRedirectStrategy();

    @Autowired
    private SecurityProperties securityProperties;


    /**
     * 当需要身份认证时，跳转到这里
     * @param request
     * @param response
     * @return
     */
    @RequestMapping("/authentication/require")
    @ResponseStatus(code = HttpStatus.UNAUTHORIZED)
    public SimpleResponse requireAuthentication(HttpServletRequest request, HttpServletResponse response) throws IOException {

        SavedRequest savedRequest = requestCache.getRequest(request, response);
        if (savedRequest != null) {
            String targetUrl = savedRequest.getRedirectUrl();
            LOGGER.info("引发跳转到请求是:" + targetUrl);
            if (StringUtils.endsWithIgnoreCase(targetUrl, ".html")) {
                redirectStrategy.sendRedirect(request,response,securityProperties.getBrowser().getLoginPage());
            }

        }
        return new SimpleResponse("访问的服务需要身份认证，请引导用户到登录页");
    }
}
